From ea93ee6db9441eb51a1d816e114b0468363dcd9c Mon Sep 17 00:00:00 2001
From: chenjigeng <178854407@qq.com>
Date: Thu, 31 Dec 2020 04:13:56 +0800
Subject: [PATCH] fix: host.isKnownTypesPackageName maybe undefined (#42050)

* fix: host.isKnownTypesPackageName maybe undefined

* feat: remove GH#18217 comment
---
 src/services/codefixes/fixCannotFindModule.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/codefixes/fixCannotFindModule.ts b/src/services/codefixes/fixCannotFindModule.ts
index a5d44c887b9..482480d8420 100644
--- a/src/services/codefixes/fixCannotFindModule.ts
+++ b/src/services/codefixes/fixCannotFindModule.ts
@@ -52,6 +52,6 @@ namespace ts.codefix {
     function getTypesPackageNameToInstall(packageName: string, host: LanguageServiceHost, diagCode: number): string | undefined {
         return diagCode === errorCodeCannotFindModule
             ? (JsTyping.nodeCoreModules.has(packageName) ? "@types/node" : undefined)
-            : (host.isKnownTypesPackageName!(packageName) ? getTypesPackageName(packageName) : undefined); // TODO: GH#18217
+            : (host.isKnownTypesPackageName?.(packageName) ? getTypesPackageName(packageName) : undefined);
     }
 }